My best friend once gave me the wisest advice: You can have it all. But not all at once. It may be that your business stays in a slower track while the kids need you, and you have to wait until a different time in your life to ramp it up. My experience is that marketing is an ongoing strategy of engagement with the customer, and these days the emphasis is on engagement more than any other time. I've been racking my brain since you asked the question trying to come up with a "least amount of time" angle and can't. It simply takes a lot of time and effort to get a business off the ground these days, seeing as how everyone has one. There's a lot of noise you have to cut through.